Electromagnetic device



UNITED STATES PATENT OFFICE.

WILLIAM O. BECK, OF RIDGEFIELD, NEW JERSEY, ASSIGNOR TO WESTERN ELECTRIC COMPANY, INCORPORATED, OF NEW YORK, N. Y., A CORPORATION OF NEW YORK.

Application ined May 11, 191s.

To all whom t may concern.'

Be it known that I, VILLIAM O. BECK, a citizen of the United States, residinor at Ridgefield, in the county of Bergen, tate of New Jersey, have invented certain new and useful Improvements in Electromagnetic Devices, of which the following is a full, clear, concise, and exact description.

This invention relates to electromagnetic devices in general and more particularly to a sensitive polarized relay adapted for general use. The types of polarized relays in use at the present time are large in size and their design is such as to prevent their being mounted on racks in accordance with the standard method of mounting other types of relays.

It is, therefore, an object of the present invention to provide a polarized relay of high sensitiveness and yet one which will be of such a size as to permit its adaptation for general use. A further obj ect is to provide a relay, the adjustments of which can be made without taking the relay out of service when a number of these relays are mounted side by side in the standard types of relay rack.

To accomplish these results, a feature of the invention resides in providing` a sensitive polarized relay, the pole pieces of which are secured to the permanent magnet and the adjustment of the separation between these pole pieces and the armature is obtained by means of adjusting screws, the ends of which engage the beveled ends of the permanent magnet and permit the spreading apart of the pole pieces. The essential parts of this relay are mounted on a bracket of non-magnetic material which is adapted to mount on the standard type of relay rack and the screws for the adjustment of the air gaps and contact springs are so located in this bracket that all adjustments can be made from the front with a screw driver and without detaching the relay from its support.

The various features of this invention may be more clearly understood by the references to the accompanying drawings, in which Figure 1 is a perspective view of a preferred type of relay embodying this invention; and Fig. 2 is a plan View of the relay shown in Fig. 1.

Referring' now to the drawing, there is provided a relay frame 5 preferably of brass Specicaton of Letters Patent.

Patented Jan. 4, 1921.

seriai No. 233,931.

and having an angled portion 6 by means of which the structure may be mounted on the standard type of mounting plate 7 a sheet 8 of fiber or similar insulating material being provided to insure the desired insulation between the relay frame and the mounting plate. The magnetizing coil 9 is provided with metal spool heads lO-IO, the lower portions of which are bent outward at an angle of 90o to provide standards for the coil and permit its being secured to the frame piece 5. The hollow core of coil 9 is dimensioned to allow clearance for the movement of the armature 11, one end of which is securely clamped to the mounting lug 12, offset at right angles to the portion 6. To this mounting lug are also secured the contact springs 13 and 14, the terminal punchings 15-15 for the winding and the punching 16 which provides means for connecting to the frame of the relay. These parts are clamped to lug 12 by means of the screws 1?-17 and the clamping plates 18 and 19, the holes in the latter being threaded. Insulating strips 20--20 of hard rubber or similar material are placed between the metal parts as shown, to provide the desired electrical separation.

A U-shaped permanent magnet 2l is located as shown on the frame piece 5, to which it is secured by means of screws shouldered in the frame piece 5 and threading into the clamping plate 22. Each of the pole pieces 23-23 is provided at one end with a slot to permit its being fastened to the end of the permanent magnet by means of screws 2li-24. These pole pieces are formed, as shown on the drawing, to approach the armature near its free end and then extend along the coil on either side, and are again bent downward and clamped to the fixed end of the armature by means of the brass screw 25. Non-magnetic shims 26-26 are provided to insure the magnetic separation at this point.

In order to provide means for adjusting the air gaps between the armature and the respective pole pieces, the ends of the permanent magnet are beveled as shown at 27-277 and adjusting screws 28-28 are provided for the purpose of independently spreading the legs of magnet 21 and thereby increasing the separation between the armature and the pole pieces. These screws are threaded in the upturned portion 29 of the trame piece o and their ends bear against the beveled surfaces of the permanent magnet. in order to prevent the ends of the magnet being displaced upward by the turning of the adjusting screws, the tapered Surfaces are also beveled in an oblique plane in such a manner that the top surface is narrower than the bottom. Adjustment of the separation between the contact point 30, located in the free end of the armature and contacts 31-3l, located in the springs 13 and 14, is obtained by means of the screws 252-32. These screws are threaded into the upturned portion 29 and are provided with insulating tips 33-38 of lavite or a similar insulating material. Saw slots 311-84 are provided for the purpose of preventing the screws from being turned out of adjustment as a result of the vibrations set up by frequent operation of the springs.

The construction as described makes it possible to provide a sensitive polarized relay small in size and one which can be mounted on a relay rack in the standard manner, since all of the adjustment screws are so located as to permit the apparatus being easily adjusted without removing it from service.

That is claimed is:

l. An electromagnetic device comprising an energizing winding, an armature therefor, a plurality of pole pieces, a permanent magnet to which said pole pieces are rigidly secured, and means engaging said magnet for varying the distance between the 'tree ends of said magnet to permit adjusting the separation between said pole pieces and said armature.

2. An electromagnetic device comprising an energizing winding, an armature therefor, a plurality of pole pieces, a permanent magnet to which said pole pieces are rigidly secured, and means adapted to vary the distance between the free ends of said magnet to permit the adjustment of the pole pieces with respect to the armature.

3. An electromagnetic device comprising an energizing winding, an armature therefor, a plurality of pole pieces, a permanent magnet to which said pole pieces are secured, the free ends of said permanent magnet being beveled, and an adjusting screw engaging the beveled surfaces of said magnet to permit the independent adjustment of either pole piece with respect to the armature.

-l. An electromagnetic device comprising an energizing winding, an armature therefor, a plurality of pole pieces, a permanent magnet to which said pole pieces are secured, the free ends of said magnet being beveled in an oblique plane whereby the angles between the beveled surface and the outer and lower surfaces, respectively, of the magnet are less than 90", and an adjusting screw engaging the beveled surfaces of said magnet to permit the adjustment of the pole pieces with respect to the armature.

5. An electromagnetic device comprising an energizing winding, an armature therefor, a plurality of pole pieces, a permanent magnet to which said pole pieces are secured, a frame piece having an extension thereto, and an adjusting screw secured in said frame piece extension and adapted t0 spread apart the free ends of said permanent magnet to increase the separation between said pole pieces.

ln witness whereof, I hereunto subscribe my name this 6th day of Ma A. D., 1918.

WILLIA O. BECK. 

